package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName="loginCheckFilter",urlPatterns ="/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求", requestURI);
        //定义不需要处理的请求路径
        String[] uris = new String[]{
                "/employee/login", "/employ.logout", "/backend/**", "/front/**"
        };

        //判断本次请求是否需要判断
        boolean check = check(uris, requestURI);
        //如果不需要处理，直接放行
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //判断登陆状态，如果已经登陆，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("employee"));
            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
        //如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }

    public boolean check(String[] uris, String requestURI) {
        for (String uri : uris) {
            boolean match = PATH_MATCHER.match(uri, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
